/Engine/Source/Editor/UnrealEd/Public/EditorViewportClient.h
Called to make a drag tool when the user starts dragging in the viewport
The new drag tool
virtual [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FDragTool](API\Editor\UnrealEd\FDragTool) > MakeDragTool ( [EDragTool::Type](API\Editor\UnrealEd\EDragTool__Type) DragToolType )